CN101639539B - Storage type earthquake signal continuous collecting system - Google Patents

Storage type earthquake signal continuous collecting system Download PDF

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CN101639539B
CN101639539B CN2009101695399A CN200910169539A CN101639539B CN 101639539 B CN101639539 B CN 101639539B CN 2009101695399 A CN2009101695399 A CN 2009101695399A CN 200910169539 A CN200910169539 A CN 200910169539A CN 101639539 B CN101639539 B CN 101639539B
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data transmission
data
transmission interface
base station
digital
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CN2009101695399A
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CN101639539A (en
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郭建
刘光鼎
罗维炳
宋祁真
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中国科学院地质与地球物理研究所
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Abstract

The invention relates to a storage type earthquake signal continuous collecting system aiming to solve the problems of narrow dynamic range and poor anti-interference ability in the prior seismometer collecting system and comprising a base station and digital geophones. The base station is connected with a plurality of digital geophones which are arranged in parallel through data transmission interfaces and cables; commands are transferred and data are collected between the base station and each digital geophone by adopting a data transmission module; the base station is a control and storage center of the storage type earthquake signal continuous collecting system and is used for controlling the data transmission interfaces and the digital geophones to finish receiving of earthquake data and store the data into an internal memory; the data transmission interfaces are used for finishing the sending of the commands and the receiving of the collected data; and the digital geophones are used for finishing the collecting of analog signals and converting the analog signals to data, and then the data transmission interfaces thereof finish the sending of the data, therefore, the invention has the advantages of wide dynamic range, strong anti-interference ability, low cost and capable of supporting collection of tens of thousands of geophones for multiple years.

Description

Storage type earthquake signal continuous collecting system
Technical field
The present invention relates to a kind of seismographic seismic signal acquiring system, particularly relate to a kind of storage type earthquake signal continuous collecting system.
Technical background
The high accuracy number seismograph is to be used for the artificial or earthquake signal of record, seek the exploration instrument for geology of oil, gas, coal and other mineral resources then according to the record of these seismic signals, and can be used for surveying earth ' s internal structure, carry out engineering and geological hazards prediction etc.
Method of seismic exploration remains the main means at land and seafari oil and natural gas at present, also be the important method of exploration of other mineral resources simultaneously, and be widely used in studying earth ' s internal structure, engineering exploration and detection, geological hazards prediction or the like aspect.The digital seismograph that is used for the mineral resources geophysical survey can be divided three classes according to data transfer mode: wire-link telemetry seismograph, wireless telemetering seismograph, no cable memory-type seismograph.
The seismographic feature of wire-link telemetry is to be sent instruction and transmitted image data by wired system fully.In present open-air practical application, occupy leading position, occupy most shares in seismograph market, the world, 408/428 series that Sercel company is arranged commonly used, System IV, the Scorpion of ION company and Aries II system, the Summit system of German DMT company, Uni Q system of U.S. WesternGeco company etc.Present instrument in China's oil and the use of gas prospecting industry greatly partly is the wire-link telemetry seismograph from external import.
The instrument that utilizes wireless system to send instruction and transmission image data is called the wireless telemetering seismograph, generally is used for surface condition construction down distinguishingly, also occupies certain market.The Wireless Seismic system of the BOX system of Fairfield company and Wireless Seismic company is the wireless telemetering digital seismograph.
No cable memory-type seismograph is a kind of seismograph of specific type, it is characterized in that: do not have big line, do not have transmission of seismic data; Each acquisition station receives blows out storage automatically after the data, with special data recovery system all is blown out data again and takes out from acquisition station.There is the part instrument to utilize wireless system, but do not receive data, do not monitor the duty of acquisition station the order such as fire of used acquisition station.
No cable formula register system (directly writing down with the paper section in early days) is all adopted in the observation of the earthquake station, and in field of seismic exploration, no cable system the earliest is the SGR (Seismic Group Recorder) of the seventies by the development of Amoco company.American I N company (former I/O company) released the long-range earthquake signal recorder of RSR (Remote Seismic Recorder) in 1999, can realize the earthquake data acquisition of 6 analog detector passages.The RSR system can with the IMAGE system compatible of ION company, the two can be formed wire and wireless and mix acquisition system.ION company 2002 with the remote logging instrument of RSR system upgrade to VectorSeis SYSTEM IV system, be called VRSR2.VectorSeis SYSTEM IV central control system has control module (being called V2), radio-frequency antenna, central transceiver and central transceiver controller to constitute.V2 by the data acquisition of acquisition instructions startup VRSR2 acquisition station, detects the state of VRSR2 by radio-frequency antenna and all VRSR2 formation radio-frequency (RF) telemetry system.Basic identical with function and the structure of RSR, but no longer support analog detector, but adopted three-component MEMS digital geophone.
No cable memory-type earthquake-capturing station is not owing to have real time monitoring record and on-the-spot quality monitoring means commonly used, so can't generally be accepted by industry member, using in China, existence does not meet problems such as Seismic Operation standard yet, up to the present, also not having cable memory-type earthquake-capturing stands in China and carries out actual seismic exploration.But because the accuracy requirement of seismic prospecting makes that the road number of seismic instrument is more and more, according to expert's estimation both at home and abroad, along with the demand of seismic prospecting precision, oil and gas industry circle needs the instrument of 30000 roads to 50000 roads soon, by 2025, perhaps we needed the earthquake-capturing instrument in 250,000 roads.And for the wired acquisition instrument more than 50000 roads, administering and maintaining of cable is very difficult, also needs to spend a large amount of costs.So it will be the developing direction of next step seismic prospecting instrument that at present a lot of scholarly forecasts do not have cable memory-type earthquake-capturing station.
At present, all large-scale seismic prospecting instruments of China all depend on from developed country's imports such as the U.S., France.Because no cable memory-type earthquake-capturing station is not also accepted by China's geophysical survey circle, also there is not this seismograph of domestic enterprise procurement at present.Homemade no cable memory-type seismic instrument also is in the development stage, does not also have formal product to come out.
Summary of the invention
The object of the invention is to overcome the above-mentioned defective of prior art, provides a kind of wide dynamic range, antijamming capability strong, can support several years even storage type earthquake signal continuous collecting system that several ten thousand roads are gathered.
For achieving the above object, storage type earthquake signal continuous collecting system of the present invention comprises with central station and not being connected and the base station and the digital geophone of data communication that its special feature is to be linked to each other with a plurality of digital geophones arranged side by side with cable by data transmission interface by the base station; Adopt data transmission module move instruction and image data between base station and the digital geophone; The base station is the control and the storage center of storage type earthquake signal continuous collecting system, and control data transmission interface and digital geophone are finished the reception of geological data, and deposit data in its built-in storer; Data transmission interface is used to finish the transmission of instruction and the reception of image data; Digital geophone is used to finish to be gathered simulating signal and converts data to, is finished the transmission of data then by its data transmission interface.Storage type earthquake signal continuous collecting system of the present invention is that a kind of base station type does not have cable memory-type seismograph, and it can be used for artificial and earthquake signals collecting, is made up of base station, data transmission interface and digital geophone etc.It has all directly carried out digital improvement at simulated earthquake wave detector or MEMS sensor place, become digital geophone, this tight connected mode (digital geophone is directly used in to finish and gathers simulating signal and convert data to) has been avoided the transmission of simulating signal on cable, the effective constituent that has kept weak signal, help digital unit and detect weak signal, improve the dynamic range of wave detector, and improved antijamming capability.Its single base station can connect the digital geophone of 120~240 passages, this means that single base station can be used as the single seismic station instrument and uses, also can synthesize several group of base stations the 3-d seismic exploration instrument use in several thousand roads even several ten thousand roads, and help the management and open-air laying of image data.
The compromised centralised storage mode (storage mode simple relatively but need huge data transport network) and the no cable memory-type seismograph distributing storage mode of wired seismic instrument of storage type earthquake signal continuous collecting system of the present invention (do not need the transmission of data, but need settle a cover storage unit and a power supply at each acquisition station (or collection point)), and the relative centralized stores mode of employing base station formula, and adopted base station formula powering mode, be a kind of low-cost seismic prospecting instrument.
In a word, it adopts digital geophone, and utilizes digital transmission module to finish data and transmit, and has improved the dynamic range and the antijamming capability of wave detector; Single base station can connect the digital geophone in 120~240 roads, can be used as the single seismic station instrument and uses, and also can synthesize several group of base stations the 3-d seismic exploration instrument use in several thousand roads even several ten thousand roads, helps the management and open-air laying of image data.It is specially adapted to the single wave detector acquisition technique of high density.Have wide dynamic range, antijamming capability is strong, cost is low, can support several years even advantage that several ten thousand road wave detectors are gathered.
As optimization, the base station is made up of main control unit and the GPS unit, storage unit, Power Management Unit and the data transmission interface that are attached thereto; It is synchronous that the GPS unit is used for time service; Storage unit is used mass storage; Main control unit is made up of ARM series CPU, SDRAM storer, USB interface and Ethernet interface, also provides serial ports to be connected with the GPS unit, and connects storage unit by bus; Power Management Unit becomes the 12V power source conversion relevant voltage to support GPS unit, storage unit, main control unit and data transmission interface; Data transmission interface and external data transfer interface are symmetrical structure, by ghost power supply technique are carried out remote power feeding, and composition data transmits passage.So design, promptly the base station is made up of GPS unit, storage unit, main control unit, Power Management Unit and data transmission interface etc.It is synchronous that the GPS unit is used for time service, and time service type GPS receiver can provide the output of 1pps time signal, can reach the precision of RMS20nS, is enough to satisfy the synchronization accuracy of instrument requirement; Storage unit is selected mass storage for use, as SD card, electronic hard disc etc., requires to satisfy the needs of storage geological data; Main control unit can (adopt different models according to different road numbers by ARM series CPU, principle is enough just to reduce power consumption), SDRAM storer, USB interface and Ethernet interface compositions such as (being used for data collection), also provide serial ports to be connected, connect storage unit by bus with the GPS unit; Power Management Unit becomes the 12V power source conversion relevant voltage to support GPS unit, storage unit, main control unit; Power supply to external data transfer interface and digital geophone is more special, and in order to strengthen power supply capacity, Power Management Unit is external data transfer interface and digital geophone power supply 12V power source conversion one-tenth ± 24V and by ghost to mode; Data transmission interface and external data transfer interface composition data transmit passage.
As optimization, data transmission interface is isolated by FPGA, crystal oscillator, communication and ghost is formed supply transformer, and FPGA provides the support of communicating by letter with crystal oscillator, and transformer provides the communication coupling and isolates, and as ghost supply transformer is realized remote power feeding; External data transfer interface composes in series data transmission channel mutually, each external data transfer interface connects the digital geophone of 30~60 passages, and each base station provides the data transmission interface of the even number our department more than 4 or 4, and each base station connects the digital geophone of 120~hundreds of passages.So design, data transmission interface composes in series data transmission channel mutually, and each data transmission interface can connect the digital geophone of 30~60 passages, so each base station can connect the digital geophone of 120~240 passages.
As optimization, described digital geophone is a kind of to be the A type, be that analog detector passes through pre-amplifying module, A/D modular converter link control module successively, control module connects data transmission interface, GPS module again and is connected pre-amplifying module by the D/A modular converter; Another kind is the D type, is that the MEMS sensor passes through ASIC integrated circuit link control module, and control module connects data transmission interface and GPS module again.Be that digital geophone is divided into two types on A type and D type, A type digital geophone is made up of control module, A/D modular converter, pre-amplifying module, wave detector, D/A modular converter and GPS module etc. for connecting analog detector; D type digital geophone is made up of control module, ASIC, MEMS sensor and GPS module etc. for connecting the MEMS sensor; These two kinds of digital geophones all are connected to data transmission interface and transmit data.
As optimization, described digital geophone structurally is made up of loam cake, outgoing cable, digitizing tablet, data transmission interface plate, detector core body, shell and tail cone; Digitizing tablet, data transmission interface plate and detector core body are encapsulated in the plastic casing by loam cake, the detector core body extraction electrode is connected on the digitizing tablet, digitizing tablet also is connected with data transmission interface plate parallel arranged, the data transmission interface plate is drawn two groups of cables, carry out data transmission and power supply serial connection, tail cone is installed in the lower end of shell.So design, be that data transmission interface and digital geophone in apparatus of the present invention storage type earthquake signal continuous collecting system adopts integrated encapsulation, one-piece construction is made up of loam cake, outgoing cable, digitizing tablet, data transmission interface plate, detector core body, shell and tail cone etc.Digitizing tablet, data transmission interface plate and detector core body are encapsulated in the plastic casing by loam cake, the detector core body extraction electrode is connected on the digitizing tablet, digitizing tablet also is connected with data transmission interface plate parallel arranged, the data transmission interface plate is drawn two groups of cables, carry out data transmission and power supply serial connection, tail cone is installed in the lower end of shell.
As optimization, described base station also is furnished with sun power and sends out electric supply installation.So design when the base station further also is furnished with sun power and sends out electric supply installation, by the timely electric energy supplement of illumination, solves the not enough problem of electric energy at any time, can improve power supply reliability greatly, supports extensive long-time earthquake to survey better.
The characteristics of storage type earthquake signal continuous collecting system of the present invention: 1. each base station can connect the digital geophone of 120~240 passages, this meaning work single base station can be used as the tableland shake instrument use (the general requirement of engineer operation has the seismograph in 24~240 roads just can meet the demands) that engineering is used, finish the engineer operation project, also can satisfy the 3-d seismic exploration instrument that several group of base stations synthesize several thousand roads even several ten thousand roads the needs of the exploration of larger hydrocarbon field, coal exploration, ore prospecting or heavy construction prospecting etc.; 2. the present invention has all directly carried out digital improvement at simulated earthquake wave detector or MEMS sensor place, become digital seismometer, this tight connected mode has been avoided the transmission of simulating signal on cable, the effective constituent that has kept weak signal, help digital unit and detect weak signal, improved wave detector dynamic range, and improved antijamming capability.3. all commercial at present no cable memory-type earthquake-capturing stations generally have only 4 with lower channel, and apparatus of the present invention single base station can connect the digital geophone of 120~240 passages, help the management and open-air laying of image data, be specially adapted to the single wave detector acquisition technique of high density.4. owing to adopted the memory-type framework, compare cost with wired seismic instrument and obviously reduce.Do not have cable memory-type seismograph with routine and compare, owing to adopted the relative centralized stores mode and relative centralized power supply system of base station formula, the whole cost of instrument also has obvious decline.
After adopting technique scheme, storage type earthquake signal continuous collecting system of the present invention has wide dynamic range, antijamming capability is strong, and cost is low, can support several years even the advantage of several ten thousand road wave detectors collections.
Description of drawings
Fig. 1 is the circuit theory diagrams of storage type earthquake signal continuous collecting system of the present invention;
Fig. 2 is the base station circuitry schematic diagram of storage type earthquake signal continuous collecting system of the present invention;
Fig. 3 is the data transmission interface circuit theory diagrams of storage type earthquake signal continuous collecting system of the present invention;
Fig. 4-the 5th, two kinds of digital geophone circuit theory diagrams of storage type earthquake signal continuous collecting system of the present invention;
Fig. 6 is the digital geophone of storage type earthquake signal continuous collecting system of the present invention and the one-piece construction synoptic diagram after the encapsulation of data transmission interface one;
Fig. 7 is that the 3-d seismic exploration survey line of storage type earthquake signal continuous collecting system of the present invention is laid synoptic diagram.
Embodiment
As shown in the figure, storage type earthquake signal continuous collecting system of the present invention comprises with central station and not being connected and the base station 1 and the digital geophone 3 of data communication, is linked to each other with a plurality of digital geophones arranged side by side 3 with cable 4 by data transmission interface 2 by base station 1; Adopt data transmission module move instruction and image data between base station and the digital geophone; The base station is the control and the storage center of storage type earthquake signal continuous collecting system, and control data transmission interface and digital geophone are finished the reception of geological data, and deposit data in its built-in storer; Data transmission interface is used to finish the transmission of instruction and the reception of image data; Digital geophone is used to finish to be gathered simulating signal and converts data to, is finished the transmission of data then by its data transmission interface.It adopts digital geophone, and utilizes digital transmission module to finish data and transmit, and has improved the dynamic range and the antijamming capability of wave detector; Single base station can connect the digital geophone in 120~240 roads, can be used as the single seismic station instrument uses, also several group of base stations can be synthesized the 3-d seismic exploration instrument use in several thousand roads even several ten thousand roads, help the management and open-air laying of image data, be specially adapted to the single wave detector acquisition technique of high density.
Base station 1 is made up of main control unit 13 and the GPS unit 11 that is attached thereto, storage unit 12, Power Management Unit 14 and data transmission interface 2; Wherein:
1, to be used for time service synchronous in GPS unit 11, select the IT03 OEM GPS of Fastrax company receiver module for use, characteristics be size little (22x23x2.7mm), power consumption ultralow (<95mW@2.7V), sensitivity very high [156dBm (tracking)], the output of accurate 1PPS time signal can reach the precision of RMS20nS and cheap, is enough to satisfy the synchronization accuracy of instrument requirement.
2, storage unit 12 is selected mass storage for use, as the SD card of 32G or the electronic hard disc of 120G etc., to satisfy the needs of storage 120 roads~240 road earthquake data.
3, main control unit 13 can (adopt different models according to different road numbers by ARM series CPU, principle is enough just to reduce power consumption), compositions such as SDRAM storer, USB interface and Ethernet interface, wherein USB interface and Ethernet interface are used for the data recovery, main control unit 13 also provides serial ports to be connected 11 with the GPS unit, connects storage unit 12 by bus.
4, Power Management Unit 14 is converted to 5V to the 12V cell voltage, 3.3V, and 2.7V, relevant voltage such as 1.8V supply with GPS unit 11, storage unit 12, main control unit 13, to external data transfer interface 2, digital geophone 3.The power supply of digital geophone 3 is more special, and in order to strengthen power supply capacity, Power Management Unit 14 is external data transfer interface 2 and digital geophone 3 power supplies 12V power source conversion one-tenth ± 24V and by ghost to mode.Power Management Unit 14 closes and opens the power supply of each unit at any time according to the instruction of main control module, detect power supply residual capacity and warning in time.
5, internal data transfer interface 2 transmits passage with external data transfer interface 2 composition datas.Data transmission interface and external data transfer interface are symmetrical structure, by ghost power supply technique are carried out remote power feeding, and composition data transmits passage.
Data transmission interface 2 is isolated by FPGA, crystal oscillator, communication and ghost is formed supply transformer etc., and FPGA provides supports of communicate by letter with crystal oscillator, and transformer provides the communication coupling and isolates, and as terrible to supply transformer realization remote power feeding; External data transfer interface 2 composes in series data transmission channel mutually, each external data transfer interface 2 connects the digital geophone 3 of 30~60 passages, and each base station 1 provides 4 our department's data transmission interfaces 2, and each base station connects the digital geophone of 120~240 passages.
Digital geophone 3 is divided into two types on A type and D type, wherein:
1, A type digital geophone is made up of control module 31, A/D modular converter 32, pre-amplifying module 33, analog detector 34, D/A modular converter 35 and GPS module 36 etc. for connecting analog detector (can be moving-coil geophone, piezoelectric seismometer and magnetic levitation wave detector etc.); Be that analog detector 34 passes through pre-amplifying module 33, A/D modular converter 32 link control modules 31 successively, control module 31 connects data transmission interface 2 again, GPS module 36 connects pre-amplifying modules 33 by D/A modular converter 35.Wherein control module 31 is made up of C51 embedded type CPU and FPGA etc., pre-amplifying module 33, A/D modular converter 32, D/A modular converter 35 adopts CS3301A/CS3302A, CS5371A and the CS5376A equal modulus conversion nest plate of Cirrus Logic company respectively, the preamplification gain that 0dB, 6dB, 12dB, 18dB, 24dB, 30dB or 36dB can program be set, realize 24 analog to digital conversion, and 4,2,1,0.5 or 0.25 sampling rate is provided.
2, D type digital geophone is made up of control module 31, ASIC integrated circuit 37, MEMS sensor 38 and GPS module 36 etc. for connecting the MEMS sensor.Be that MEMS sensor 38 passes through ASIC integrated circuit 37 link control modules 31, control module 31 connects data transmission interface 2 and GPS module 36 again.
These two kinds of digital geophones 3 all are connected to data transmission interface 2 and transmit data.GPS module 36 is selected the IT03 OEM GPS of Fastrax company receiver module equally for use, because GPS single-point bearing accuracy is lower, be generally ± 10m, and the positioning accuracy request of seismic prospecting is at decimeter grade, so can not satisfy positioning requirements with single GPS location.And the advantage of seismic prospecting be tens or the scope of hundreds of square kilometre in, can lay hundreds of even several ten thousand GPS websites are measured, thereby form large-scale GPS station network, utilize this large-scale GPS network to carry out after measuring error eliminates, can reach the bearing accuracy of centimetre-sized.
Described digital geophone 3 and data transmission interface adopt integrated encapsulation, and one-piece construction is made up of loam cake R1, outgoing cable 4, digitizing tablet R3, data transmission interface plate R4, detector core body R5, shell R6 and tail cone R7; Digitizing tablet R3, data transmission interface plate R4 and detector core body R5 are encapsulated in the plastic casing R6 by loam cake R1, detector core body R5 extraction electrode is connected on the digitizing tablet R4, digitizing tablet R3 also is connected with data transmission interface plate R4 parallel arranged, data transmission interface plate R4 draws two groups of cables 4, carry out data transmission and power supply serial connection, tail cone R7 is installed in the lower end of shell R6.
3-d seismic exploration survey line is as shown in Figure 7 laid example: establish the single wave detector exploration of high density, requiring ground to gather density is 10m * 20m, and the single acquisition area is about 10,000m * 10,000m.If the collection road number of each base station is 4 * 60 roads, then need 9 base stations to form 1080 roads at line direction, survey line length is 10790m.Vertically need 250 base stations to form 500 roads, width is 9980m.Need 2250 base stations altogether, add up to 270,000 roads.At present, the instrument cost in 270,000 roads is also too high, also can't realize commercialization, but this also develops the power of low-cost instrument just.
Described base station can also further be furnished with sun power and be sent out electric supply installation.

Claims (2)

1. storage type earthquake signal continuous collecting system comprises not being connected with central station and the base station and the digital geophone of data communication, it is characterized in that being linked to each other with a plurality of digital geophones arranged side by side with cable by data transmission interface by the base station; Adopt data transmission module move instruction and image data between base station and the digital geophone; The base station is the control and the storage center of storage type earthquake signal continuous collecting system, and control data transmission interface and digital geophone are finished the reception of geological data, and deposit data in its built-in storer; Data transmission interface is used to finish the transmission of instruction and the reception of image data; Digital geophone is used to finish to be gathered simulating signal and converts data to, is finished the transmission of data then by its data transmission interface;
The base station is made up of main control unit and the GPS unit, storage unit, Power Management Unit and the data transmission interface that are attached thereto; It is synchronous that the GPS unit is used for time service; Storage unit is used mass storage; Main control unit is made up of ARM series CPU, SDRAM storer, USB interface and Ethernet interface, also provides serial ports to be connected with the GPS unit, and connects storage unit by bus; Power Management Unit becomes the 12V power source conversion relevant voltage to support GPS unit, storage unit, main control unit and data transmission interface; Data transmission interface and external data transfer interface are symmetrical structure, by ghost power supply technique are carried out remote power feeding, and composition data transmits passage;
Data transmission interface is isolated by FPGA, crystal oscillator, communication and ghost is formed supply transformer, and FPGA provides the support of communicating by letter with crystal oscillator, and transformer provides the communication coupling and isolates, and as ghost supply transformer is realized remote power feeding; External data transfer interface composes in series data transmission channel mutually, each external data transfer interface connects the digital geophone of 30~60 passages, and each base station provides the data transmission interface of the even number our department more than 4 or 4, and each base station connects the digital geophone of 120~240 passages;
Described digital geophone is a kind of to be the A type, is that analog detector passes through pre-amplifying module, A/D modular converter link control module successively, and control module connects data transmission interface, GPS module again and is connected pre-amplifying module by the D/A modular converter; Another kind is the D type, is that the MEMS sensor passes through ASIC integrated circuit link control module, and control module connects data transmission interface and GPS module again;
Described digital geophone structurally is made up of loam cake, outgoing cable, digitizing tablet, data transmission interface plate, detector core body, shell and tail cone; Digitizing tablet, data transmission interface plate and detector core body are encapsulated in the plastic casing by loam cake, the detector core body extraction electrode is connected on the digitizing tablet, digitizing tablet also is connected with data transmission interface plate parallel arranged, the data transmission interface plate is drawn two groups of cables, carry out data transmission and power supply serial connection, tail cone is installed in the lower end of shell.
2. according to the described storage type earthquake signal continuous collecting system of claim 1, it is characterized in that described base station also is furnished with sun power and sends out electric supply installation.
CN2009101695399A 2009-09-09 2009-09-09 Storage type earthquake signal continuous collecting system CN101639539B (en)

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